GASTROPODA— MURICID7E. 785 



Chesapeakean of Maryland and Virginia; Pliocenic-Recent on 

 southern Atlantic coast of United States. 



578. U. (Scalaspira) strumosa (Conrad). (Fig. 1147.) Miocenic. 

 Differs from the other species in its flat shoulder and flat sides 



of whorls, marked by two or three very strong spirals, the lower 

 one covered at the suture and cancellated by narrow, distant, ver- 

 tical ribs. 



Chesapeakean of Maryland and Virginia, etc. 



CLXXVIII. Murex Linn. 

 Round whorled or angular whorled fusiform shells, the spire 

 ribbed and with spirals, aperture drawn out anteriorly into a 

 straight or curved canal; outer lip expanded into a varix with or 

 without simple or compound spines; varices of former aperture 

 persistent, three or more to a volution. This includes a number of 

 distinct genetic series. Cretacic-Recent. 



579. M. mississippiensis Conrad. (Fig. 1 148.) Oligocenic-Recent. 

 Small, with three non-spinous varices and often two or more 



faint, rounded ribs between the varices ; spirals compound, strong, 

 often crowded ; canal strongly deflected, very narrow. 



Vicksburgian beds of Mississippi; Chipolan and Silex beds of 

 Florida. 



580. M. (Chicoreus) rufus Lamarck. Miocenic ?-Recent. 

 Of moderate size, with three varices of much divided or fron- 



FlG. 1 148. Murex mississippiensis. Fig. 1149. Typhis curvirostratus. 



(After Conrad.) (After Conrad.) 



dose spines, with a single large rib between the varices, anterior 

 end of canal deflected. 



Miocenic of North Carolina; Pliocenic of Florida; Post-Plio- 

 cenic of Antilles; living from Cape Fear, N. C, to the Gulf. 



